Transmitting and receiving attachment for telephones



(No Model.)

H. W. LIBBEYQ HMENT FOR TELEPHONES. Patented July 30, 1895.

TRANSMITTING AND RECEIVING ATTAO No. 543,626.

UNITED STATES PATENT OFFICE.

HOSEA W. LIBBEY, OF BOSTON, MASSACHUSETTS.

TRANSMITTING AND RECEIVING ATTACHMENT FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 543,626, dated July 30,1895.

Application filed October 9, 1894. SerialNo. 525,359. (No model.)

To aZZ whom it may concern.-

Be it known that I, HOSEA W. LIBBEY, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented certain new and useful Improvements in Transmitting andReceiving Attachments for Telephones, of which the following, taken inconnection with the accompanying drawings, tion.

My invention relates to certain improvements in transmitting andreceiving attachments for telephones; and the invention consists of tworeceptacles the casings of which are arranged one within the other, therear of the outer one being attached to the transmitter and the rear ofthe inner one to the receiver, as hereinafter fully described, andpointed out in the claims.

Referring to the accompanying drawings, Figure 1 represents a horizontallongitudinal section of a transmitting and receiving at tachment fortelephones embodying my in-- vention. Fig. 2 is a front view of same.Fig. 3 is a perspective view of. the inner casing, taken on line on on,Fig. 1. Fig. 3 is a vertical longitudinal section of the transmittingand receiving attachment, taken on line 00 a: of Fig. 1. Fig. 4 is asectional view of a modified form of the inner casing. Fig. 5 is a frontview of another modification.

A represents the outercasing, which is at its rear end attached to thetransmitter B. This casing I prefer to form of a bell shape, as shown,(but it might be of any other desired shape,) and forms asound-receptacle A to receive the voice to be transmitted.

O is an inner receptacle, the casing O of which is preferably of conicalform. To the inner end of this casing is attached the receiver D. Thelarge end of this cone is cut back a suitable distance, as shown, from cto d, to form a re-entrant angle, the mouth being covered by a piece E,which near the is a specificasecured. in any suitable manner, thusgiving support to the rear end of the inner casing.

The object of having the conical casing C out back, as described, toform a re-entrant angle is to allow the voice to freely pass into theouter receptacle A and prevent the escape of sound through the innercasing.

The apparatus can be supported in any suitable'place, as upon a wall ordesk, and the voice will be received and can be delivered without havingto place the ear or mouth close to the apparatus.

In Fig. 4 I have shown a modified form of the inner casing. In this caseit is cut back on both sides instead of on one side only, as beforedescribed; and in Fig. 5 I have shown a modification in which apartition 0 is employed instead of the conical casing O. In this casethe sound would be received on one side of the instrument andtransmitted on the other side; but the results would not be sosatisfactory as with the construction first described.

What I claim is 1. In combination with a telephone trans mitter andreceiver an attachment consisting of an outer casing to receive thevoice to be transmitted and convey it to the transmitter and an innercasing to receive the voice from the receiver and deliver the samesubstantially as set forth.

2. A transmitting and receiving attachment for telephonesconsisting ofan outer casing A, forming a sound receptacle A, an inner conical casingO, the front end of the same being cut to form a re-entrant angle asdescribed and its mouth covered by a piece having a lip substantially asand for the purposes set forth.

3. The combination of a telephone transmitter and casing forming a soundreceptacle attached thereto with a receiver D, and casing 0', attachedthereto and arranged within the outer casing A, substantially as and forthe purposes set forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 28th day of February, A.D. 1894.

' HOSEA W. LIBBEY.

Witnesses:

CHAS. Srnnnn, EDWIN PLANTA.

